5.5.44 mysql_set_charset

This extension was deprecated in PHP 5.5.0, and it was removed
in PHP 7.0.0. Instead, the
MySQLi or
PDO_MySQL extension
should be used. See also
MySQL:
choosing an API guide and
related
FAQ for more information. Alternatives to this
function include:

The MySQL connection. If the link identifier is not
specified, the last link opened by
mysql_connect
is assumed. If no such link is found, it will try to
create one as if
mysql_connect
had been called with no arguments. If no connection is
found or established, an E_WARNING
level error is generated.